by noseoil » Tue Sep 22, 2015 7:07 am
The 5' x 10' x .040" was delivered yesterday morning. Ended up costing right at $250 with shipping, for 2 sheets delivered where I work. Not too bad, but still a bit "spendy" for this type of material. It's 5052 H3 & looks pretty good.
I have a question about expansion on the roof. My "normal" temperatures will range for a low sometimes in winter of about 20f degrees to a high of about 110f. Add to the upper end of things by another 20-30 degrees when it's in full sun & I'm wondering about the effect this will have on the aluminum on the roof. I'll have a splice on the front at about 2' up from the lower edge at the front, so the overall length of the main roof panel will be about 8' long. Just ran the numbers & I think it may expand & contract about 3/16" in the extreme range of heat it will likely see over a year.
If it's .040" aluminum, does anyone think I'll see any "real" difference in the skin as it cycles in the heat? I'm thinking I'll put it on when it's about 90f outside, which is the normal temperature when I'm working. It will be fastened down at the back, where the hinge is screwed down at the last spar, at the vent opening in about the middle of the run, and then at the front edge where the air conditioner opening is located. It will overlap the front sheet from the top by about 1 1/2". The outside edges will be screwed down with some trim, which has butyl rubber tape under it. Thinking I'll bed the sheet at the edges with Osi Quad sealant to make a barrier against water.
Just curious about how it will look over time when it's hot & cold outside. With .040" I really shouldn't see any oil canning, right? Does this sound about right for putting things in place?